A word about this mall: It isn’t a mall, exactly. There’s no Forever 21, no Spencer Gifts, just, among other things, an antiques store, a model train exhibit, and a pro wrestling museum. In the back, a function hall—the kind of nondescript space that generally hosts flea markets and craft fairs—will tonight welcome Double Decker/Square of Opposition Anniversary Fest. It will also be the last place Snowing ever plays together. Which, truthfully, is exactly as it should be.